Rear o2 sensor?

[jenic]

I know this doesn't control anything as such, but i presume the voltage should constantly vary like the front?

Mine is just sitting at 409.92mV :S

If it is f**ked, well no fault codes are showing, and no lights are on so I guess its stopped working in a 'good' position?

 

[shiyan]

Mine is constant at 0.37-0.38V. I think if that voltage goes up and down like the front then your catalyst is broken

 

[mr.pink87]

it´s fine, the cat saves remaining oxygen and reacts it with the emission gases which causes a constant oxygen content behind the converter.

 

[Sean6545]

Yep, any fluctuation in the rear sensor would indicate catalyst fault.

 

[jenic]

Interesting, so it would appear my cat is working fine, but still rattling like a b**ch

 

[MicKPM]

As above, the post-Ho2 sounds fine to me. 100% Sure its the CAT rattling about... it's a Renault afterall? What made you suspect the Post Ho2?